Charles Feelgood Fever Volume 3.... FREE!

Dr. Martin Luther King Jr
CNN has an amazing documentary series called "The Sixties"
these are all worth watching

Charles Feelgood and his mix that includes excerpts from King's famous "I have a Dream" speech

Fever Volume 3
go to 15:20 if you want to start with the FREE aspect of that mix

two great random searches
Free and Dream